Apparatus for tracking integrated circuit devices
US4454413A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Feb 19, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2893
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A plurality of carriers for integrated circuit devices are each uniquely coded so as to be recognizable by an automatic decoding apparatus. The devices are tested and the test results accurately correlated with the appropriate devices by recording the test results for each device, reading the identification code for each carrier in the same sequence in which the devices are tested, and then correlating the test results with the device identifications. A prior art requirement of maintaining the carriers in the order in which they were tested is eliminated once the carriers have been thus identified. In a preferred embodiment the carrier body is provided with an array of perforations, the transmission of light through each perforation being blocked by a breakable membrane. Each carrier is coded by breaking a selected combination of its membranes to establish a unique binary identification code for each carrier. The carriers are identified during or immediately after testing by illuminating one side of the perforation array and sensing the pattern of light emitted from the opposite side of the array. In another embodiment the carriers are uniquely identified by bar code displays which…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.